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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) counterparty | Dec. 31, 2017 USD ($) counterparty | Jun. 30, 2017 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Average days to maturity | 57 days | 44 days |
Interest payable | $ 4,200 | $ 2,500 |
Advance rate | 90.20% |  |
Average haircut | 9.80% |  |
Repurchase agreements, number of counterparties | counterparty | 9 | 10 |
Cash and cash equivalents | $ 84,717 | $ 95,191 | $ 75,391
Unencumbered investment securities | $ 318,000 |  |
Liquidation proceeds, percentage | 34.10% |  |
Lender Concentration Risk | Stockholders' Equity |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Repurchase agreements, number of counterparties | counterparty |  | 10 |
Concentration risk, percentage |  | 5.00% |
Deutsche Bank AG, London Branch | Lender Concentration Risk | Stockholders' Equity |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Concentration risk, percentage | 6.80% |  |
Jefferies And Company, Inc | Lender Concentration Risk | Stockholders' Equity |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Concentration risk, percentage | 5.20% |  |
CMBS |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Average haircut | 25.00% |  |
Unencumbered investment securities | $ 98,800 |  |
Agency RMBS |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Average haircut | 5.00% | 5.00% |
Non-Agency RMBS |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Average haircut | 25.00% |  |
Unencumbered investment securities | $ 42,200 |  |
Residential Mortgage Backed Securities |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Unencumbered investment securities | 177,000 |  |
Loans |  |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |  |
Repurchase agreement, amount outstanding | $ 1,200,000 | $ 1,300,000 |
Weighted average interest rate | 2.76% | 2.18% |

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